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encoder/flac: use fifo_buffer instead of pcm_buffer

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This fixes a buffer corruption bug; pcm_buffer is not designed to be a
persistent buffers, and will discard anything between two consecutive
calls.
This commit is contained in:
Max Kellermann
2011-11-28 08:00:10 +01:00
parent 790823abb4
commit cee5036aca
3 changed files with 24 additions and 17 deletions
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36
src/encoder/flac_encoder.c
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@@ -22,6 +22,8 @@
#include "encoder_plugin.h"
#include "audio_format.h"
#include "pcm_buffer.h"
#include "fifo_buffer.h"
#include "growing_fifo.h"
#include <assert.h>
#include <string.h>
@@ -38,8 +40,11 @@ struct flac_encoder {
struct pcm_buffer expand_buffer;
struct pcm_buffer buffer;
size_t buffer_length;
/**
* This buffer will hold encoded data from libFLAC until it is
* picked up with flac_encoder_read().
*/
struct fifo_buffer *output_buffer;
};
extern const struct encoder_plugin flac_encoder_plugin;
@@ -140,11 +145,8 @@ flac_write_callback(G_GNUC_UNUSED const FLAC__StreamEncoder *fse,
{
struct flac_encoder *encoder = (struct flac_encoder *) client_data;
char *buffer = pcm_buffer_get(&encoder->buffer, encoder->buffer_length + bytes);
//transfer data to buffer
memcpy( buffer + encoder->buffer_length, data, bytes);
encoder->buffer_length += bytes;
growing_fifo_append(&encoder->output_buffer, data, bytes);
return FLAC__STREAM_ENCODER_WRITE_STATUS_OK;
}
@@ -156,8 +158,8 @@ flac_encoder_close(struct encoder *_encoder)
FLAC__stream_encoder_delete(encoder->fse);
pcm_buffer_deinit(&encoder->buffer);
pcm_buffer_deinit(&encoder->expand_buffer);
fifo_buffer_free(encoder->output_buffer);
}
static bool
@@ -201,10 +203,10 @@ flac_encoder_open(struct encoder *_encoder, struct audio_format *audio_format,
return false;
}
encoder->buffer_length = 0;
pcm_buffer_init(&encoder->buffer);
pcm_buffer_init(&encoder->expand_buffer);
encoder->output_buffer = growing_fifo_new();
/* this immediatelly outputs data throught callback */
#if !defined(FLAC_API_VERSION_CURRENT) || FLAC_API_VERSION_CURRENT <= 7
@@ -325,16 +327,18 @@ static size_t
flac_encoder_read(struct encoder *_encoder, void *dest, size_t length)
{
struct flac_encoder *encoder = (struct flac_encoder *)_encoder;
char *buffer = pcm_buffer_get(&encoder->buffer, encoder->buffer_length);
if (length > encoder->buffer_length)
length = encoder->buffer_length;
size_t max_length;
const char *src = fifo_buffer_read(encoder->output_buffer,
&max_length);
if (src == NULL)
return 0;
memcpy(dest, buffer, length);
encoder->buffer_length -= length;
memmove(buffer, buffer + length, encoder->buffer_length);
if (length > max_length)
length = max_length;
memcpy(dest, src, length);
fifo_buffer_consume(encoder->output_buffer, length);
return length;
}